Inductive coupling device



S. BALLANTINE INDUCTIVE COUPLING DEVICE Nov. 4 1924.

Filed. Dec. 19 1922 swam Mot;

caudion base and contact members.

Patented Nov. 4, 1924.-

UNITED STATES 1,514,416 PATENT OFFICE-1..

STUART BALLANTINE, OF BOONTON, NEW JERSEY, ASSIGNOR TO RADIO FREQUENCY LABORATORIES, INCORPORATED, OF BOONTON, NEW JERSEY, A CORPORATION OF NEW JERSEY.

INDUGTIVE COUPLING DEVICE.

Application filed December 19, 1922. Serial No. 607,852.

T 0 all echo-m it may concern Be it known that I, STUART BALLANTINE, a citizen of the United States, residing at Boonton, in the county .of Morris and State of New Jersey, have invented certain new and useful Improvements in Inductive Coupling Devices, of which the following is a specification.

This invention relates to coupling devices employed for the coupling of electric circuits, and particularly to a device used as a coupling element between two audions.

An object of the invention is to provide a coupling device which may be readily placed in position on an instrument board or panel to effect the coupling of two circuits. More specifically, an object of the invention is to provide a coupling device carried by a base r tlpon which are arranged contact members which serve as the terminals for the wind ings of the device, and which base and con tact members have the form of a standard A furvariable coupling device of the type stated and in which the operating knob or dial is provided with graduations which are readily observable when the device is in position in a suitable socket.

Embodiments of my invention are illustrated in the accompanying drawings in which- Fig. l is a perspective view, partly in section, in which the electrical circuits of the coupling device are shown diagrammatically,

I Fig. 2 -'s a bottom view of the coupling device,

Fig. 3 is a similar bottom view illustrating a different arrangement of the terminal contacts,

Fig. 4 is a plan of a standard form of socket with which the coupling device may be associated, and

Fig. 5 is a horizontal section through the coupling device.

In the drawings, the shell constituting the main body of the casing which encloses the coupling device is designated by the numeral 1, and comprises a thin tube which is referably of metal-since it is usually desirable to prevent the electric and mag- 'netic fields set up by the device fromextending beyond the same. The shell 1 is so that the indicatin "read from a position 1n front of the device.

mounted on a base 2 which carries a plurality of contacts 3, and the base 2 and con .tacts 3 are so designed that the windings of the coupling device are automatically included in the appropriate electric circuits when the base 2 is inserted in a suitable socket or panel mounting. The size and shape of the base 2 and the arrangement of the contacts 3 may be varied to adapt the device for use with any desired socket or mounting, but I prefer to employ a construction' suitable for. use with a standard type of socket such as used for audions. Vith such constructions the base 2 comprises a cylindrical portion which carries a rial 5 which furnishes a support for the contacts 3. When the main .shell 1 differs in size or shape from the cylindrical shell of the base 2, a flange 6 serves to join the base to the main shell and this flange may be formed on either shell or as a separate element which may be connected to both shells. In the preferred construction, however, the flange 6 is formed on the base 2 and is provided with an inturned flange 7 within which the shell ,1 of the casing may seat.

The upper closure 8 of the casing is provided witha similar fian 'e for engagement over the upper edge of the shell 1. When the coupling device includes an adjustable element, the operating shaft 9 of the device passes through an opening in the upper closure 8 and carries a suitable knob or dial 10. At some point which may be easily seen when the device is in position, a fiducial mark 11 is placed on the flange of the closure 8 and the dial carries graduations 12 for indicating the adjustment of the movable element. As the. effective range of adjustment of the movable element is usually less pling device will ordinarily be vertical when mounted in a standard socket, the outer edge of the dial 10 is made substantially vertical scale may be easily As indicated above, the specific shape of the base and the arrangement of the contacts may be varied to adapt 'the coupling device ;:for use with any desired socket. One such modification is shown inFig. 3, in which the contacts 3 are arranged for use in an Aeriotron tube socket. I

'Any' suitable coupling device may be mounted in the casing, but the construction is particularly adapted for use with variotransformers embodying the construction described in the copending application of Hull and Seabury, Serial No. 609,230, filed Dec. 27, 1922. While the specific construction of the coupling device forms no part of the present invention, the arrangement of 4 3 which serve as terminals for the primary I ing at the left of the socket. The binding I winding will engage the contact arms 16, 16,

which extend from the binding posts 17 lyposts 18 at the right hand of the socket then serve as terminals for the secondary winding. When the coupling device employed is a vario-transformer, the low side of the secondary may be grounded to the casing by connecting the appropriate contact 3 to the casing as by means of a metal strip 19.

It will be apparent that the invention is not limited to the specific embodiments herein described, but that various changes may be made in the several parts, their relative size, shape, and location, since coupling devices of various sizes and shapes may be employed with different types of sockets or instrument panel mountings.

I claim:

1. The combination with an inductive coupling device, of a casing for housing said device, contacts forming terminals. for the windings of said device, and a base on said casing and carrying said contacts, said base and contacts being adapted for engagement in a socket having contact arms.

2. The combination withan inductive coupling device, of a casing for housing said device, contacts forming terminals for the windings of said device, and a socket base on said casing and carrying said contacts, said base and contacts being ada ted for engagement in a. socket of standar design.

3. The combination with an inductive coupling device, of a shell for housing said device, and end closures for said shell, one of said closures comprising a'standard socket base carrying contacts which serve as terminals for the windings of said device;

4. The combination with a vario-transformer comprising a rotor, a stator and primary and se'condary windings thereon; of acasing for housing said vario-transformer, and a support for said casing comprising a socket base having contacts serving as terminals for said windings. I

5. The combination with a vario-transformer comprising a rotor, a stator and primary and secondary windings thereon, of a shell for housing said vario transformer, a closure for one end of said shell having an opening therethrough for the shaft of. said rotor, and a closure for the opposite end of said shell comprising a socket base having contacts serving as terminals for said windm s. Y

. The combination with a vario-transformer, of a metal shell for housing the same, end closures for said shell, one of said closures comprising a socket base carrying insulated contacts which serve as terminals for the windings of said vario-tran'sformer,

and means for grounding one of said coutacts to said shell.

7. The combination with a. vario-transformer comprising a rotor, a stator and primary and secondary windings thereon; of a metal'casing for housing said vario-transformer, a support for said casing comprising a socket base having insulated contacts serving as terminals for said windings, and means for grounding one side of the secondary winding to said casing.

8. The combination with a vario-transformer comprising a rotor, a stator and primaryand secondary windings thereon, of ashell for housing said vario-transformer, a closure for one end of said shell having an opening therethrough for the shaft of said rotor, a dial on said shaft having a circumferential surface of substantial width, an indicating scale on said circumferential surface, a. fiducial mark on the adjacent surface of said end closure, and a closure for the opposite end of said shell comprising a socket base having contacts serving as terture.

, STUART BALLANTINE. 

